DESCRIPTION- OF GENERA AND SPECIES. 231 



Eyes: Ocular quad on a rounded prominence, wliicli projects in front, leaving MF on 

 separate tubercles; decidedly wider in front than behind, and length greater than front 

 width. MR separated by about 1.5 diameters, MF by scarcely more than a radius ; space 

 between MF and SF but little greater than that between IMF; side eyes on tubercles, 

 separated by about a radius; not greatly differing in size, but SF somewhat larger. Front 

 row recurved, rear row. which is decidedly longer, slightly procurved, almost aligned. The 

 space between SR and MR is about twice the diameter of the latter ; the clypeus about the 

 height of one diameter MF. 



Legs: 1, 2, 4, 3; stout, short, yellow, with dark shades upon the femora; well provided 

 with yellowish bristles and gray pubescence ; sufficiently provided with stout, brownish 

 spines ; palps colored and armed as the legs ; mandibles blackish brown ; conical ; parallel ; 

 slightly inclined backward. 



Abdomen: A long oval, not greatly differing in width throughout, Init widest at the 

 middle, and in specimens in hand rather narrowed at the base, which uuich overhangs the 

 cephalothorax. Tlie skin is glossy, covered with a yellowish white pubescence, which, being 

 removed, leaves numerous minute pits. The folium is outlined on either side by a broad 

 brown band, somewhat undulating at the margin; while a reticulated yellow ribbon occu- 

 pies the median, narrowing both at the front and the apex, on either side of which are 

 symmetrically placed five impressed dob^, of which the basal pair are the largest. Both on 

 tile base and apex the brown marginal bands deepen into black. On the sides are reticu- 

 lated ribbons of yellow, like that upon the dorsal median, and below this again mottled 

 bands of brown, which quite encompass the spinnerets and the apex of the abdomen, 

 which projects beyond the spinnerets about quarter the length of the venter. The latter 

 is a broad band of brownish color, with interrupted and reticulated yellowish marginal 

 ribbons, which pass as far as the spinnerets. The epigynum (Fig. 2b) has a short, sub- 

 rectangular, spooned scapus, which does not extend beyond the apical margin of the 

 atriolum, which presents towards the venter a deeply indented parm. 



Distribution : St. Louis, Missouri ; District of Columbia. (Marx Collection.) I am com- 

 pelled here to differ with the opinion of Dr. Marx (expressed both in his Catalogue and 

 in tlie Synonyma of Keyserling's Epeiridte) that this species is Hentz's Epeira rubella. 

 The thin legs and characters of the cephalothorax and abdomen, as shown in Hentz's 

 drawings, appear to me to be too unlike the spider here described to justify the supposed 

 identity. 



No. 83. Singa Listerii, new sijecies. Plate XIX, Figs. 3, 4. 



Female : Total length, 5 mm. ; abdomen, 3.5 mm. long, 2 mm. wide. This species closely 

 resembles S. Keyserlingi ; but in a large number of specimens from Georgia and North 

 Carolina the differences in the shape and markings of the abdomen and color of the head 

 are persistent. The midfront eyes are smaller than, or at least equal to, the midrear, while 

 in S. Keyserlingi the midfront eyes are the larger. The ocular quad in S. Keyserlingi is 

 relatively wider in front than in S. Listerii, wherein the quad is slightly narrower than, or 

 at least equal to, the midrear area. Moreover, in S. Keyserlingi the side eyes are well 

 separated, while in S. Listerii they are nearly contingent. 



CEPHAL0TH0R.4X : Oval ; the corselet high, well rounded, cordiform ; the fosse a lateral 

 pit; sloping to the base, which is notched; base of caput not lower than summit of corselet; 

 the head slightly elevated in the middle, but depressed at the face ; cephalic suture well 

 marked; corselet grooves distinct; color glossy; slightly pubescent; yellow, with ,_dark 

 streaks along the corselet grooves and caput ; sternum shield shaiied, slightly longer than 

 broad; sternal cones distinct before all the coxse ; dark brown, with a lighter yellowish 

 band in the centre, where it is elevated ; labium subtriangular, color of sternum, not half 

 the height of the maxillae, which are colored as the sternum, as wide as long. 



Eyes : Fig. 3b. Ocular quad on a rounded eminence, the centre of which is blackish ; 

 the width in front slightly narrower than behind, or at least not wider; the sides of 

 greatest length; MF somewhat smaller than MR; MF separated by about or a little more 



